In our town when the prices go up, they go up all over town in about 5 mintues.. We went from $3.19 to $3.29 today.. I think they are all connnected on the net somehow because you can't ever beat the price change around town. All the stations go out in the same few minutes and up the price.. coming down, its a bit slower..
The thing that gets me is that it went up 20¢ a gallon today and it can easily go up another 15¢ or 20¢ tomorrow.. Once the prices start to climb you can hardly keep pace.